Cumulus clouds are often described as looking like cotton balls, but they can actually be composed of millions of tiny water droplets or ice crystals.
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Nowcasting often relies on rapidly updating data sources like radar and social media to provide hyperlocal weather forecasts covering just the next few hours.
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Noctilucent clouds are so high in the atmosphere that they are still illuminated by the sun even after it has set below the horizon for ground observers.
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